vmcore-dmesg ends with "No program header covering vaddr"

[Prasad Koya]

Hi

I'm increasing dmesg buffer size at runtime by passing log_buf_len=1M
(or 512K) at command line. At compile time, I have LOG_BUF_LEN as
256K. However, when this kernel crashes (crashkernel set at 64M),
vmcore-dmesg fails with below error.

No program header covering vaddr 0xffff88013ff00000found kexec bug?

Am I missing something here?

Thank you.

Here are some debugs I added to kernel. This is with 3.4 kernel and
I've tried with kexec-tools-2.0.4.

[    0.000000] log_buf_len_setup: log_buf_len 262144 new 1048576
ffffffff8170b140
[    0.000000] setup_log_buf: early 1 262144 new_log_buf_len 1048576
[    0.000000] log_buf_len: 1048576 ffff880037d58000
[    0.000000] early log buf free: 258671(98%)
[    0.000000] setup_log_buf: early 0 1048576 new_log_buf_len 0
[    0.503752] log_buf_kexec_setup: lbl 1048576 new 0 ffffffff816198c4
logbuf ffff880037d58000
In kdump, running vmcore_dmesg /proc/vmcore
No program header covering vaddr 0xffff88013ff00000found kexec bug?